Cho hai đường tròn (O ; R) và (O' ; R') tiếp xúc ngoài tại A. Kẻ một đường thẳng bất kì qua A và cắt (O); (O') tại B, C. Tỉ số k của phép vị tự tâm A biến B thành C là
A.
B.
C.
D.

Find a mistake in the four underlined parts of the sentence and correct it:
The General Certificate of Secondary Education (GCSE) is the name of a set of English qualifications, generally
taking by secondary school students at the age of 15-16 in England.
A. the name
B. a set of
C. taking
D. at the age

Trong mặt phẳng Oxy cho đường tròn (x-8)2+(y-4)2=4 . Ảnh của đường tròn qua việc thực hiện liên tiếp phép tịnh tiến theo v→(1;5) và phép quay tâm O góc 45° là
A. (x-92)2+(y-9)2=4
B. (x-92)2+y2=4
C. x2+(y-92)2=4
D. (x+9)2+(y-9)2=4

Cho tam giác ABC có BD, CE là phân giác trong và BD; CE cắt nhau tại I. Qua A vẽ các đường vuông góc với BD, CE lần lượt cắt BC tại M, N. Câu sai là
A. BD là trục đối xứng của AM.
B. AI = IN
C. MN có trục đối xứng là đường thẳng qua I.
D. I là tâm đường tròn ngoại tiếp ΔANC.

Find a mistake in the four underlined parts of the sentence and correct it:
There are dangerous times in a marriage, especially when the wife can come to feel such overburdened that she decides to end the relationship.
A. dangerous times
B. especially
C. such
D. decides

Find a mistake in the four underlined parts of the sentence and correct it:
Our continuously economic growth, the maintenance of our quality of life, and assurance of our security all depend on a abundant, affordable supply of electricity.
A. growth
B. assurance
C. all
D. a

Find a mistake in the four underlined parts of the sentence and correct it:
Had you told me that this was going to happen, I would never believe it.
A. Had you told
B. was going
C. to happen
D. believe

Find a mistake in the four underlined parts of the sentence and correct it:
I didn’t see Mary since she went to live in the capital. 
                                    
A. didn’t see
B. went
C. to live
D. the capital

Find a mistake in the four underlined parts of the sentence and correct it:
 Just as I had got to an interesting part of the story, the doorbell rang.
A. Just
B. had got
C. interesting
D. rang

Find a mistake in the four underlined parts of the sentence and correct it:
He is the only member of the gang who’s identity has remained a secret.
A. the only
B. of
C. who's
D. has remained